Wall ventilator



H. L. BROWN WALL VENTILATOR Filed Dec. 18, 1925 Patented first. 5, i925.

HERBERT L. BROWN, OF RICHMOND, VIRGINIA.

wALL VENTILATOR.

Application filed December 18, 1925.

The object of this invention is to provide a simple ventilator forwalls, stair-risers, etc., that will prevent the adjustment beingtampered with after the ventilator is set in the wall. This type ofventilator is particularly adapted for the intake or exhaust air-finesin theaters, churches, auditoriums, etc. Where it is used in a gallery,it is set in the riser. In this type of ventilator, it is desirable thatthe damper-plate shall be looked in its adjusted position in such manner that it would be difficult for an unauthorized person to tamper withthe adjustment. The damper-plate may be adjusted from time to time bythe use of special tools and only with more effort than would be exertedby one who was unauthorized to readjust the damper.

In the drawing Fig. 1 is a vertical sectional view of my improvedventilator set in place in a wall opening;

Fig. 2 is a View looking at the inner side of the ventilator.

' Referring to the drawing annexed by reference-characters, 5 designatesthe usual metallic grating that is adapted to be set into theventilating opening in the wall or riser. To the inner side of thisgrating, at the lower edge thereof, is pivoted a damper-plate 6 whichinclines upwardly and inwardly, thereby extending partly across theair-flue. This pivoted damper-plate is held in its adjusted position bymeans ,of a pivoted rackbar 7 and a bendable lock-ear 8 carried by thedamper-plate.

The rack-bar is pivoted to the grating by a horizontal pivot and tendsto swing downwar'dly at its inner free end. This rack-bar 40 extendsthrough a slot in the damper-plate,

and this slot is formed by cutting orstamping out of the damper-platethe aforesaid lock-ear 8. The parts are locked by first swinging thedamper-plate to the desired p0- Serial Not. 76,206.

sition, then swinging the free end of the raclebar upwardly until thedesired notch in its upper curved edge engages the top edge of the slotin the damper-plate; then i the lock-ear is bent either backward-1y orforwardly until it impinges against the lower curved edge of therack-bar, thereby gagement with the damper-plate.

It will be observed that I provide a very simple mechanism for lockingthe damperplate son'1ipermanently and that the adjustment of thedamper-plate can be disturbed too troublesome What I claim only bymanipulation of tools that would be for one to resort to who wasunauthorized to change the adjustment.

as new is locking the rack-bar withits notch in en 1. In a ventilator ofthe type set forth, a grating for the opening of the air-flue, a dainperplate pivoted to one of the horizon tal edges of the grating adapted toswing inwardly into the air-flue, and a notched rack-bar pivoted to thegrating and extendlng inwardly through an elongated opening in thedamper-plate, the damper-plate carrya ing'a bendable lug adapted to be.bent against the edge of the rack-bar opposite the notches therein.

2. In a ventilator of the type set forth, a grating adapted to be setinto the opening of the air-flue,

a sheet-metal damper-plate pivoted to the inner side. of the grating atthe lower edge thereof so as to be capable damper-plate.

In testimony whereof signature.

I hereunto aflix my HERBERT L. BROWN.

